/*
	Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
	Copyright (C) 2023 Spacebar and Spacebar Contributors
	
	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Affero General Public License as published
	by the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.
	
	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Affero General Public License for more details.
	
	You should have received a copy of the GNU Affero General Public License
	along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

import { getIpAdress, route } from "@spacebar/api";
import { Ban, DiscordApiErrors, emitEvent, getPermission, Guild, Invite, InviteDeleteEvent, PublicInviteRelation, User } from "@spacebar/util";
import { Request, Response, Router } from "express";
import { HTTPError } from "lambert-server";
import { UserFlags } from "@spacebar/schemas";

const router: Router = Router({ mergeParams: true });

router.get(
	"/:invite_code",
	route({
		responses: {
			"200": {
				body: "Invite",
			},
			404: {
				body: "APIErrorResponse",
			},
		},
	}),
	async (req: Request, res: Response) => {
		const { invite_code } = req.params;

		const invite = await Invite.findOneOrFail({
			where: { code: invite_code },
			relations: PublicInviteRelation,
		});

		res.status(200).send(invite);
	},
);

router.post(
	"/:invite_code",
	route({
		right: "USE_MASS_INVITES",
		responses: {
			"200": {
				body: "Invite",
			},
			401: {
				body: "APIErrorResponse",
			},
			403: {
				body: "APIErrorResponse",
			},
			404: {
				body: "APIErrorResponse",
			},
		},
	}),
	async (req: Request, res: Response) => {
		if (req.user_bot) throw DiscordApiErrors.BOT_PROHIBITED_ENDPOINT;

		const { invite_code } = req.params;
		const { guild_id } = await Invite.findOneOrFail({
			where: { code: invite_code },
		});
		const { features } = await Guild.findOneOrFail({
			where: { id: guild_id },
		});
		const { public_flags } = await User.findOneOrFail({
			where: { id: req.user_id },
		});
		const ban = await Ban.findOne({
			where: [
				{ guild_id: guild_id, user_id: req.user_id },
				{ guild_id: guild_id, ip: getIpAdress(req) },
			],
		});

		if (ban) {
			console.log(`[Invite] User ${req.user_id} tried to join guild ${guild_id} but is banned by ${ban.user_id === req.user_id ? "User ID" : "IP address"}.`);
			throw DiscordApiErrors.USER_BANNED;
		}

		if ((BigInt(public_flags) & UserFlags.FLAGS.QUARANTINED) === UserFlags.FLAGS.QUARANTINED) {
			console.log(`[Invite] User ${req.user_id} tried to join guild ${guild_id} but is quarantined.`);
			throw DiscordApiErrors.UNKNOWN_INVITE;
		}

		if (features.includes("INTERNAL_EMPLOYEE_ONLY") && (public_flags & 1) !== 1) {
			console.log(`[Invite] User ${req.user_id} tried to join guild ${guild_id} but is not staff.`);
			throw new HTTPError("Only intended for the staff of this instance.", 401);
		}

		if (features.includes("INVITES_DISABLED")) {
			console.log(`[Invite] User ${req.user_id} tried to join guild ${guild_id} but joins are closed.`);
			throw new HTTPError("Sorry, this guild has joins closed.", 403);
		}

		const invite = await Invite.joinGuild(req.user_id, invite_code);

		res.json(invite);
	},
);

// * cant use permission of route() function because path doesn't have guild_id/channel_id
router.delete(
	"/:invite_code",
	route({
		responses: {
			"200": {
				body: "Invite",
			},
			401: {
				body: "APIErrorResponse",
			},
			404: {
				body: "APIErrorResponse",
			},
		},
	}),
	async (req: Request, res: Response) => {
		const { invite_code } = req.params;
		const invite = await Invite.findOneOrFail({ where: { code: invite_code } });
		const { guild_id, channel_id } = invite;

		const permission = await getPermission(req.user_id, guild_id, channel_id);

		if (!permission.has("MANAGE_GUILD") && !permission.has("MANAGE_CHANNELS")) throw new HTTPError("You missing the MANAGE_GUILD or MANAGE_CHANNELS permission", 401);

		await Promise.all([
			Invite.delete({ code: invite_code }),
			emitEvent({
				event: "INVITE_DELETE",
				guild_id: guild_id,
				data: {
					channel_id: channel_id,
					guild_id: guild_id,
					code: invite_code,
				},
			} as InviteDeleteEvent),
		]);

		res.json({ invite: invite });
	},
);

export default router;
